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authorZhaolei <zhaolei@cn.fujitsu.com>2015-08-06 21:56:58 +0800
committerChris Mason <clm@fb.com>2015-08-09 07:07:14 -0700
commit93314e3b64fd2e77237fdba7cfcc0d38dcd05579 (patch)
tree16a545b8fb3679186e8092414e6c4693ceb795b6 /fs/btrfs/ctree.c
parent147d256e0980e31505d25d721be979d6a8d2148c (diff)
downloadlinux-93314e3b64fd2e77237fdba7cfcc0d38dcd05579.tar.bz2
btrfs: abort transaction on btrfs_reloc_cow_block()
When btrfs_reloc_cow_block() failed in __btrfs_cow_block(), current code just return a err-value to caller, but leave new_created extent buffer exist and locked. Then subsequent code (in relocate) try to lock above eb again, and caused deadlock without any dmesg. (eb lock use wait_event(), so no lockdep message) It is hard to do recover work in __btrfs_cow_block() at this error point, but we can abort transaction to avoid deadlock and operate on unstable state.a It also helps developer to find wrong place quickly. (better than a frozen fs without any dmesg before patch) Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r--fs/btrfs/ctree.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 54114b4887dd..5f745eadf77d 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1159,8 +1159,10 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) {
ret = btrfs_reloc_cow_block(trans, root, buf, cow);
- if (ret)
+ if (ret) {
+ btrfs_abort_transaction(trans, root, ret);
return ret;
+ }
}
if (buf == root->node) {